Recoil check



Dec. 22I 1925.`

s. FURMIDGE RECOIL CHECK 2 Sheets-'Sheet 1 Original Filed Aug. 13. 1919 Dec. 22l 1925.

2' Sheets-Sheet 2 S. FURMIDGE REcoIL CHECK Original Filed Aug. 155. 1919 Patented Dec. 22, 1925.

UNITED STATES.

1,566,393 PATENT/OFFICE.

SAMUEL FURMIDCE, orY CHICAGO,V ILLINOIS.

RECCIL CHECK..

Applicationfiledl August 13, A1919, Serial No. 317,298. Renewed .Tune 26, v1922. Serial No. 570,938.

To all whom t may Concern.' Y

Be it known that I, SAMUEL FURMIDGE, a citizen of the United States, residing at Chicago, county of Ceol, State of Illinois, haveinvented a certain new and useful Improve-v ment in RecoilV Checks, and declare the fol.-

lowing tobea full, clear, and exact descrip-v tion of the same, such as will enable othersV skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

lily invention has for its object to produce a simple, compact, efficient and durable device adapted to be connected between two members, one of which is supported from the other byv means of springs` and reduce the recoil of the springs after they have been compressed. Y

A' further object of the present invention is'to produce a simple and novel recoil check in which the resistance will be substantially uniform throughout the entire yrange of movements of the co-operating parts.'

The variousfeatures Vof novelty whereby my invention is characterized will hereinafter be pointed out with particul'arity in the claims; but for a full understanding of my invention, and of its objects and advantages, reference may be had to the following detailed description taken in connection with the accompanying drawings, wherein:

Figure 1 is a side view of a device arranged in accordance with a preferred form of my invention, the housing being shown in section;

Fig. 2 is a section taken approximately on line 2 2 of Fig. l;

Fig. 3 is a View similar to Fig. 2, the holding plate illustrated in Fig. 2 being omitted; and

Fig. 4; is a section taken approximately on line 4-4 of Fig. 1.

Referring to the drawing, 1 represents a suitable drum adapted to be attached, for example, to the frame of an automobile; the drum being disposed on one side of a circular plate, 2, on the opposite side of which is a suitable clamping jaw, 3, for holding the device in place. Surrounding the drum is an almost complete ring, 4:, having a width approximately equal to the axial length of the drum. The ring is preferably faced on the inner side with a layer, 5, of material such as used for brake bands, so as to create considerable frictional resistance when it is attempted to slide the ring around the drum while pressure is exerted tending to hold the ring against the drum. Beside the end of the drum lies a strong spiral spring, 6,

'the outer end of which is connected to the drum as indicated at 7, while the inner end is bent radially into the form of an arm, 8,

` and the spring, the bolt being made long enough to permit the cable to be tied upon or looped about one end, as indicated at 12.

The spring surrounds a short hub, 13, projecting axially from the drum, and revoluble onY this hub is a guard plate, 14, which engages at the corners with the drum and holds the spring in place. A cover or housing, 15, surrounds the drum and parts mounted on the latter; the housing being conveniently held in place yby means of a bolt, 16, passing through the hub, 13, and the housing.

lVhile the cable may be wrapped around the drum in either direction, I prefer to lead it from its point of attachment to the ring entirely around the ring before it crosses the gap between the two ends. However, no matter in what direction the cable is Wound. a pull on the freev end thereof' tends to tighten it upon the drum, and therefore tends to squeeze or compress the ring tightly about the drum. At the same time, if the pull on the cable is sufficient to overcome the tension of the spring, the ring will be caused to slip or slide around the drum, thus adding its frictional resistanceto the resistance of the spring to retard the movement of the cable and ring.

The parts are so proportioned that when the device is placed between two relatively movable members, such as the frame an'd axle of an automobile, the spring in the device will cause the cable to be wrapped around the drum without leaving any slack when the said members are nearest each other. Consequently, as said members move away from each other, the cable will be unlli) wound, pulling the brake ring around upon the drum and thus retar'ding` the separating' movement between said members. 'Vhen said members again approach each other the spring will take up the slack in the cable and move the brake ring` in friction al Contact with the drum.

It will he seen that the Whole inner suriace oi the ring is at all times in Contact f7 with the drum, so that there is no variation in the effective area of the frictional or braking surface ot' the movable element of the device, as would be the case if the niovable brake element were a strap or band wound directly upon the drinn so as to he capable ot slipping thereon. Uniform pressure on the ring may be maintained at all times by making enough turns of: the cable around the drum so that it will at all times be wrapped around the drum at least one whole turn.

I claim:

l, In combination, a circular member, a split element surrounding the periphery of the circular member, resilient means connected to one end of the split element, and a flexible element attached to the said end of the split element completely wrapped around the periphery of the split element and then crossing the gap between the ends of the said element.

2. ln combination, a drum, a split brake band surrounding the periphery of the drum and provided with a frictional material on its inner periphery, a spring connected to one end of the split band, and a eXible pulling element attached to the said end of the split band completely' encirclingi the periphery of the split band and then crossing the gap between the ends thereof.

3. In combination, a stationary drum, a split brake band surrounding the periphery of the drum and provided with a frictional material on its inner periphery, a spring connected at its outer end to the drum and at its inner end to one end of the split band,

and a ileXible pulling element attached to the said end of the split band completely en circling the periphery of the split band and then crossing' the gap between the ends of the said band.

4. In combination, a stationary drum, a clamping plate integral with the said drum, a split element surrounding the periphery of the drum, resilient means connected to one end of the split element, and a flexible pulling element attached to the said end of the split element completely wrapped around the periphery of the split element and then crossing the gap between the ends of the said element.

5. In combination, a` stationary drum, a clamping plate integral therewith, a split brake band surrounding the periphery of the Idrum and provided with a frictional material on its'inner periphery, spring connected at its outer end to the drum and its inner end to one end of the split band, and a flexible pulling element attached to the said end of the split band completely encircling the periphery ot thesplit band and then crossing` the gap between the ends ot the said band.

SAMUEL FURMIDGE. 

